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 TM 55-1905-221-14-2
5-12.1.
ALTERNATOR (Continued)
LOCATION/ITEM
ACTION
REMARKS
TESTING (Cont)
2. In-Vessel Testing
CAUTION
Do not under any circumstances, short FIELD terminal of alternator to ground. Do not disconnect
regulator while alternator is operating. Do not disconnect alternator output lead from alternator while the
alternator is operating.
NOTE
The following test procedures may be performed to determine the condition of the alternator and regulator
while still in the vessel. When making the alternator system test, the batteries must be in good condition
and fully charged.
a.
Check voltage across auxiliary
terminal and negative output
terminal with DC voltmeter.
Correct voltage is 0.2 volt.
If the voltage exceeds this
value, the isolation diode
is defective.
b.
Place jumper wire across oil
pressure switch on propulsion
unit to short out switch.
Check voltage across auxiliary
terminal, and negative output
terminal with DC voltmeter.
Correct voltage is 1.8 - 2.5
volts. This test evaluates
field circuit. If voltage at
auxiliary terminal is higher
than specified, field circuit
is defective - check brushes.
If voltage reads 0 volts at
auxiliary terminal, check
field excitation device and
associated circuit. If
voltage is not correct,
perform test in step f.
5-155
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